Stackable workbench



FIG. 1 is an top perspective view of a stackable workbench;

FIG. 2 is a left side elevation view of a stackable workbench;

FIG. 3 is a right side elevation view of a stackable workbench;

FIG. 4 is a front side elevation view of a stackable workbench;

FIG. 5 is a rear side elevation view of a stackable workbench;

FIG. 6 is a top side elevation view of a stackable workbench; and,

FIG. 7 is a bottom side elevation view of a stackable workbench. 

CLAIM The ornamental design for a stackable workbench, as shown and described. 